JPS6211107B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for uniformly applying a dyebath onto a ribbon of fibrous material.

Various methods are known in practice for applying treatment baths containing dyes and chemicals to webs of fibrous material. Examples include padding, slop padding, spraying, electrical application, foaming, printing and material suction. The application of dyebaths with suction cloths has also been described. However, with all these dyebath application methods, it has not been possible to control the predetermined application amount automatically and uniformly over the width of the strip of fiber material.

In connection with the above, when using padders as at the same time the best conceived and probably the best known application device, mechanical squeezing out of the excess liquid takes place after the impregnation operation. However, control of this squeezing stroke takes place only via mechanical pressure control of the rolls, which again shows that this control is limited. This is because, although in this case the liquid absorption decreases as the pressure increases, this liquid absorption does not occur in inverse proportion to the pressure. In addition to this, the absorption of the dyebath is dependent on the running speed of the material. It is therefore known to those skilled in the art that different moisture contents often appear on the material after squeezing.

The only possibility of precise control over the amount of dyebath applied is to make a hydrometric determination of high moisture application (100% and more dyebath absorption) and to determine the weight per area. It's about doing. The latter of these methods uses radiation-based components, is expensive, and
And it only takes place in one place.

The problem of the present invention is to continuously measure, record and automatically control the moisture content applied to the fiber material to continuously dye or finish the fiber material at a constant speed. A process in which a treatment liquid is uniformly applied onto a moving ribbon of fibrous material, the measurement being carried out immediately after the application device for the inter-dyeing bath through which the ribbon of fibrous material runs. A method of applying the processing liquid as described above is carried out by a contact method, and this method obviates the known drawbacks in this field with the prior art discussed above.

This problem is solved according to the invention by means of frequency-modulated microwaves, which can be used to control different humidity levels of the impregnated fiber material, which are sometimes present instantaneously, distributed over the entire width of the fiber material strip. The values are detected continuously and the measurement results obtained in this way and transmitted with a small amount of inertia are used to measure the width of the fiber material strip of the dyebath application device connected in front, corresponding to the measuring position. The solution is to individually control the application rate of a plurality of sections of the strip material extending over and separately adjustable, directly with respect to a predetermined dyebath application rate.

With the method according to the invention, the moisture content value detected at the measuring location is the basis for controlling, for example, the roll pressure in the packer, the control being carried out via electrical and/or pneumatic control elements. In order to ensure useful control of the dyebath absorption, it is advantageous to set up at least as many measuring positions over the width of the material as are controllable in the application device.

By the method of the present invention, the desired dye bath absorption rate of the fabric (dye bath absorption - standard value) is programmed and input into the limit switch circuit, and in this way a standard system for dye bath absorption is established. Advantageously, it is configured by establishing. Corresponding to this new technology, from the very beginning of the dyebath absorption process, for example, the roll pressure of the pazda can be determined in this way over the entire width and the dyebath absorption rate achieved by this roll pressure. The dye bath absorption rate (dye bath absorption-actual value) is increased until it coincides with this limit value. The moisture content present instantaneously during the course of the absorption operation is measured continuously over the width of the material strip and is also measured continuously - almost without any delay - uniformly over the width of the material strip. The moisture content limit is adjusted so that a suitable dyebath absorption is achieved.

Advantageously, the adjustment of the squeezing pressure necessary for uniform application of moisture over the width of the strip material is controlled automatically and by electrical means. For this purpose, the squeezing pressure is adjusted in such a way that the moisture content value occupies a predetermined value over the entire width of the material. Each other moisture content value within the range of the standard system that allows operation under such conditions causes an indication on the optical display device to appear different from the predetermined limit value.

The principle of the method according to the invention is to transmit the measured dyebath absorption value directly, that is to say without inertia and without any delay, for example to the drawing pressure. In this case, the roll itself is adjusted individually depending on the circuit of each throttle section. This results in an unobjectionable adaptation of the liquid absorption rate to the fabric surface or texture. As already mentioned, the transmission of the measured values takes place without inertia. This means that
This means that erroneous factors caused by, for example, different dye absorption rates no longer occur.

Of course, the method according to the invention can also be applied to other dyebath application systems other than Batuda, as long as there is a possibility of modification over the entire width of the material. Thus, for example - instead of the roll pressure of the pads -
By means of a predetermined or programmed dye bath absorption rate it is possible to vary the dye bath pressure at the various spray heads over the width of the material. It is also fundamentally possible to control the amount of foam flowing out of the various slit nozzles. In other similar operations, for example in the case of application by means of a suction cloth, it is also possible to moderate the reabsorption of the dyebath by controlling the squeezing action of this suction cloth.

Corresponding to the method of operation according to the invention, contactless control of the moisture content of the textile material and low inertia of the dye bath application can be carried out by means of a measuring principle based on microwave absorption. In this connection, the present invention relates to the applicant's Federal Republic of Germany Utility Model No.
The advantages of a device according to the measuring principle of the type described in No. 7638683 are utilized. This device is a device for simultaneously detecting the moisture content in the side and central portions of a strip of fiber material, and allows the amount of dye bath applied to a flat molded article to be measured even in a high moisture range. and the device comprises microwave transmitters (horn transmitters) connected to a microwave oscillator and distributed over the width of the strip of material and correspondingly provided microwave receivers. It consists of The measurement principle of devices working on the basis of microwave absorption, whose purpose is to determine the amount of microwave energy reaching the receiver from the transmitter through the strip material, is applied to the control of the application device. This measuring device comprises as many horn emitters and receivers as there are possible controls present in the application device. The measurement of dyebath absorption is carried out immediately after the dyebath application device over the entire width of the strip of material. The display of the measured value takes place without any delay and the mV used for adjusting the application device
- Provides a range of control pulses. Accuracy of measurement is 0.5
~3%. Modulation of the microwave frequency of the transmitter (e.g. with a wavelength of 2.4 to 3.7 cm) eliminates the need for inordinately time-consuming adjustments of the device, and the position of the strip of material during measurement as well as its flapping is no longer important. isn't it.

Already in practice by setting up only one measuring point, which is worked by the reflected microwave radiation and which is moved laterally across the material in a zigzag manner. Compared to the measurement methods previously carried out, the measurement according to the invention advantageously uses at least three horn emitters with correspondingly arranged receivers over the entire width of the strip of material. It has the advantage of being equipped with When the measuring head is guided laterally, not only are there many failures of the device, but corrections take too much time. Furthermore, when measurements are made by lateral movement of the measuring head, the movement of the material has an adverse effect on the measurement results.

The method according to the invention provides a series of advantages that characterize this new technique compared to conventional methods for controlling dyebath application.

As already mentioned, this new mode of operation allows for uneven dye bath application compared to the adjustment to the desired absorption and uniform dyebath application over the entire width of the strip material, which was previously done by experience. Material losses with dyeing results are extremely low.

During material running, this mode of operation can be switched over to liquid treatment of textile materials of other qualities without particular difficulty. This allows the use of small yard sticks. This makes the arrangement of the mechanisms of the working device very fluid. The dyeing obtains a very high degree of uniformity over the width of the strip material.

The dyebath application to the ribbon fiber material can be adjusted reproducibly without any objections. This regeneration is always possible even if the same quality of material is processed at intervals of several weeks or even months.

Different qualities of materials often result in different application conditions in order to reach the same moisture content. Due to the quality-dependent predetermined moisture content during the dye bath application operation and the automatic adjustment of this predetermined moisture content, the application of the adjustment method from one textile material to another can be done directly and programmatically. This is possible without recombination.

Claims (1)

[Claims] 1. Constantly measuring the moisture content applied on the fiber material,
A method of continuously dyeing or finishing textile materials through recording and automatic control, in which a treatment solution is applied uniformly onto a strip of textile material moving at a constant speed, and at this time, measurement is performed. In the method for applying the treatment liquid, which is carried out by a non-contact method based on microwave absorption immediately after the application device for the inter-dyeing bath through which the strip-like fiber material runs, the process liquid is applied in a direction parallel to the feed direction of the strip-like fiber material. At a number of measurement positions provided as a fibrous material, the impregnated fibrous material, which is present instantaneously, is measured by means of simultaneously frequency-modulated microwaves. Different values of the humidity are detected continuously and the measurement results obtained in this way and transmitted with a small amount of inertia are used to determine the length of the strip of fiber material in the dyebath application device connected in front, corresponding to the measuring position. homogeneous application of said treatment liquid, characterized in that the application rate of a number of parts of the strip material extending over its entire width and which can be adjusted separately is individually controlled directly with respect to the predetermined dyebath application rate; method for. 2. The method as claimed in claim 1, wherein at least three measuring positions are provided behind the dyebath application device over the entire width of the strip of fibrous material. 3. The method according to claim 1 or 2, wherein the desired dyebath absorption amount is programmed into a limit switch circuit. 4. The method as claimed in claim 1, wherein the application of the dyebath is controlled by the squeezing pressure of the pad, which can be adjusted in segments over its entire width. 5. The method according to claim 1, wherein the dyebath application is controlled separately by the pressure of the dyebath exiting from a spray nozzle provided with a segmented strip of fibrous material. . 6. Controlling the dye bath application based on the dye bath flow rate or foam flow rate from a slit nozzle provided in segments over the entire width of the strip-shaped fiber material;
A method according to any one of claims 1 to 3.